Poll: Looks like a runoff in U.S. Senate race

Lt. Gov. David Dewhurst leads national tea party favorite Ted Cruz by 40 percent to 31 percent among likely GOP voters in a new poll by the University of Texas/Texas Tribune — fueling the idea that the two will head to a runoff after the May 29 primary.

Former Dallas mayor Tom Leppert was third with 17 percent.

Dewhurst needs a majority of votes in the May 29 GOP primary to win without a runoff.

The margin of error was plus-or-minus 5.92 percentage points on the question.

The internet survey was conducted May 7-13 and has a margin of effort of plus or minus 3.46 percentage, but questions asked only of Republicans or Democrats have larger margins of error.